The Vapolution 2.0 straight stem - medium is 8mm
The Vapolution 2.0 straight stem - large is 9mm
The Vapolution 2.0 bent stems are 9mm
(These are the ones Vapehunter used that have the increased thickness over the 8mm & 9mm straight stems which increased the draw restriction. I owned one & can confirm the draw is super tight!)
The Vapolution 2.0 All-In-Wonder Bowl is 9mm
(As I mentioned above, the AIWB is the same thickness like the Vapolution 2.0 bent stem w/ all the draw restriction problems. But to my surprise the draw restriction is way more open & free flowing unlike the bent stem even though they're the same thickness!
)
The Vapolution 2.0 large 9mm straight stems & the AIWB (if your into dry hits which I know aren't your fav) are the ones you or anyone else would need.
Quick note about the 8mm medium straight stems. I ordered a couple of these w/ my 1st Sup b/c the fit was so crazy fuckin' tight w/ the stock alu stem. After the fit became a bit looser & I started using the stock stems & large Vapo2 9mm stems instead, I stopped using the 8mm for awhile. Now I like to use it when I hit the Sup sorta like a log. Heat her up to around 350-360°F then insert the stem after its reached peak temp, hit, remove stem & it's all flavor city after that. And the 8mm stem holds the least amount (9mm glass stem holds 1.5x more) & is easier to slide in & out
than the 9mm which makes it great for this particular purpose.